The chemical principles of the metallic arts ; with an account of the principal diseases incident to the different artificers; the means of prevention and cure ; and a concise introduction to the study of chemistry / By W. Richardson.

  • Richardson, William, 1791-1863.
Date:
1790
Catalogue details

Licence: Public Domain Mark

Credit: The chemical principles of the metallic arts ; with an account of the principal diseases incident to the different artificers; the means of prevention and cure ; and a concise introduction to the study of chemistry / By W. Richardson. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    tlnfture. Syrup of violets is ufed for common ex- periments. Chemifts have divided acids into three clafifes, viz, Mineral,Vegetable, and Animal; accord- ing to the nature of the fubjeft from which they are produced. The vegetable acids are fubdivided into native and fa6lidous, which are produced by fermen- tation. To the latter clafs may be referred thofe acids feparable from vegetables by dillillation. Thefe generally have a burnt fmeil, ^ and are called Empy- reumatic Acids. I. MINERAL ACIDS. I. Vitriolic Acid, commonly called Oil of Vitriol, or Spirit of Vitriol. The vitriolic acid is fo called from the ancient method of extra6t- ing it from green vitriol. But now it is more pro- fitably obtained from the combuftion of fulphur. This acid when perfectly pure, is tranfparent; but its attraction for phlogiftic fubftances is fo ftrong, thac whenever it comes in contadt with them, it foon be- comes of a dark color. Its fpeclfic gravity is dou- ble that of water j for if a pint of water weigh one pound, the fame quantity of vitriolic acid will weigh two pounds. It has a very ftrong attradion for water. * It